Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4921306
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Funding
- FAME, one of six centers of STARnet, a Semiconductor Research Corporation
- MARCO
- DARPA
- Intel [2011-IN-2152]
- NSF [DMR-1210850, ECCS-1002358]
- Center for NanoFerroic Devices (CNFD)
- Nanoelectronics Research Initiative (NRI)
- DFG/NSF in the framework of the Materials World Network program
- CAPES Foundation, Ministry of Education of Brazil
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210850] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1309416] Funding Source: National Science Foundation
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We study thin films and magnetic tunnel junction nanopillars based on Ta/Co20Fe60B20/MgO multilayers by electrical transport and magnetometry measurements. These measurements suggest that an ultrathin magnetic oxide layer forms at the Co20Fe60B20/MgO interface. At approximately 160 K, the oxide undergoes a phase transition from an insulating antiferromagnet at low temperatures to a conductive weak ferromagnet at high temperatures. This interfacial magnetic oxide is expected to have significant impact on the magnetic properties of CoFeB-based multilayers used in spin torque memories. (C) 2015 AIP Publishing LLC.
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